DE102006056150A1 - Electromagnetic rays radiating device for use in display device, has radiation uncoupling surface arranged in ray path of radiation-emitting arrangement, and radiation-steering unit directing electromagnetic ray to uncoupling surface - Google Patents

Abstract

The device (100) has radiation-emitting arrangements (1, 2) respectively including radiation-emitting units (10, 20) for radiating respective electromagnetic rays (13, 23). A radiation uncoupling surface (5) is arranged in a ray path of the radiation-emitting arrangement (2), and a radiation-steering unit (3) directs the electromagnetic ray (13) to the radiation uncoupling surface. The electromagnetic ray (13) is controlled by the radiation-steering unit (3) toward the ray path of the electromagnetic ray (23). The arrangement (1) is arranged laterally offset to the uncoupling surface. An independent claim is also included for a display device comprising a liquid crystal matrix.

Description

The The present invention relates to a device for radiation Electromagnetic radiation and a display device according to the generic terms of the independent ones Claims.

At least a task of certain embodiments It is the object of the present invention to provide a device for radiation a first and a second electromagnetic radiation via a radiation coupling specify. Furthermore, it is an object of certain embodiments, to provide a display device with such a device.

The Tasks are performed by the items with the characteristics of each independent claims solved. advantageous embodiments and further developments of the objects are in the dependent claims and continue to be understood from the description below and the drawings.

• – eine erste strahlungsemittierende Anordnung mit zumindest einem ersten strahlungsemittierenden Bauelement, das die erste elektromagnetische Strahlung abstrahlt,
• – eine zweite strahlungsemittierende Anordnung mit zumindest einem zweiten strahlungsemittierenden Bauelement, das die zweite elektromagnetische Strahlung abstrahlt, und
• – ein strahlungslenkendes Element, wobei
• – die Strahlungsauskoppelfläche im Strahlengang der zweiten strahlungsemittierenden Anordnung angeordnet ist und
• – das strahlungslenkende Element die erste elektromagnetische Strahlung zur Strahlungsauskoppelfläche lenkt.

A device for emitting a first and a second electromagnetic radiation via a radiation decoupling surface along a device beam path comprises in particular

• A first radiation-emitting arrangement with at least one first radiation-emitting component which radiates the first electromagnetic radiation,
• A second radiation-emitting arrangement with at least one second radiation-emitting component which radiates the second electromagnetic radiation, and
• - A radiation-directing element, wherein
• - The radiation decoupling surface is arranged in the beam path of the second radiation-emitting device and
• - The radiation-directing element directs the first electromagnetic radiation to the radiation decoupling surface.

there can the first electromagnetic radiation and the second electromagnetic Radiation wavelengths from an ultraviolet to infrared wavelength range and in particular wavelength from a visible wavelength range and thus be visible light. Particularly preferred may be such wavelength and wavelength ranges to be emitted, which is a white one and in particular a cold white or a warm white Illuminating a viewer can awaken. Furthermore, the first and / or the second electromagnetic radiation wavelengths or Wavelength ranges exhibit a colored light impression with a viewer can awaken. It can the first electromagnetic radiation and the second electromagnetic Radiation equal with respect to their respective spectral components or be different from each other.

at a further embodiment becomes the first electromagnetic radiation through the radiation-directing Element in the direction of the beam path of the second electromagnetic Radiation directed. This can be advantageous to the first electromagnetic Radiation and the second electromagnetic radiation from the radiation decoupling surface in the same direction are radiated. in particular, the radiation-directing Element directing the first electromagnetic radiation to the radiation decoupling surface, that the beam path of the first and the second radiation-emitting arrangement is transferred into the common device beam path of the device. In particular, the radiation decoupling surface can be a main expansion direction exhibit. The first radiation-emitting arrangement can thereby be arranged laterally offset from the radiation decoupling surface. Especially This may mean that when the radiation coupling surface is monitored, the first radiation-emitting arrangement laterally or laterally arranged offset to the radiation decoupling surface appears.

at a further embodiment the radiation-directing element has side surfaces and main surfaces on. In this case, the first electromagnetic radiation from the first radiation-emitting arrangement over a side surface in the Radiation-deflecting element are radiated and directed to a main surface become. One of the main surfaces can thereby at least partially form the radiation coupling-out surface.

Farther can the first electromagnetic radiation in a solid angle range be emitted in which the radiation decoupling surface or not only partially arranged. It can be particularly advantageous, for example when the first electromagnetic radiation collimates in such a way and / or is shadowed that the first electromagnetic radiation mainly is emitted parallel to the radiation decoupling surface.

In a preferred embodiment, the first electromagnetic radiation is emitted at least over a first subregion of the radiation decoupling surface and the second electromagnetic radiation is emitted at least over a second subregion of the radiation decoupling surface. In this case, the first subarea and the second subarea may in each case include contiguous or even separately arranged subareas of the radiation decoupling surface. The first subarea and the second subarea may be, for example be different from each other. This may mean, in particular, that the first subarea and the second subarea are arranged next to one another, for example adjacent to one another and adjacent to one another. In particular, the first subregion can preferably enclose the second subregion. Furthermore, the first partial area and the second partial area can also at least partially overlap. In this case, it may also be that the first partial area completely covers the second partial area, which means that the second partial area is a partial area of the first partial area. Particularly preferably, the second subregion is delimited on at least two sides by the first subregion. In this case too, the first subregion and the second subregion can at least partially overlap or they can be different from one another. Furthermore, the second partial area can also be delimited on all sides by the first partial area. Particularly preferably, the second subregion can be arranged centrally with respect to the first subregion.

at a further embodiment has the first electromagnetic radiation in the first subregion a first luminance. The luminance of the first electromagnetic radiation in the first subsection over the first subarea to be constant or a luminance gradient exhibit. Furthermore, it may be possible be that the first electromagnetic radiation in the second subrange has a second luminance, which at no point in the second Subarea greater than the first luminance is. For example, the second luminance less than 50%, in particular less than 25% or in particular less than 10% of the first luminance of the first electromagnetic Radiation in the first subarea is. In particular, the luminance the first electromagnetic radiation in the first and / or in the second Subrange vary continuously or in the transition change abruptly from the first to the second subarea.

at a further embodiment has the second electromagnetic radiation in the second subregion a Luminance, which preferably has such a distribution, that the luminance of the total radiated from the radiation decoupling surface electromagnetic radiation consisting of the first and the second electromagnetic Radiation, in particular in the first and / or in the second partial area equal or approximate equal to the first luminance of the first electromagnetic radiation in the first subarea. Here, "approximately equal" can mean that the Luminance in the first and / or in the second partial area around not more than 10%, preferably not more than 5% of the first luminance deviates in the first subarea.

at a preferred embodiment is the radiation-directing element in the beam path of the second radiation-emitting Arrangement arranged.

at a particularly preferred embodiment the radiation-directing element has a light guide or consists of such, which has a radiation entrance surface over which the first electromagnetic radiation coupled into the optical fiber can be. Furthermore, the light guide may have a radiation exit surface over which the first electromagnetic radiation can be coupled out. Furthermore, the optical waveguide can preferably be opposite to the radiation exit surface arranged surface, in the following also back area called, over at least partially the second electromagnetic radiation can be coupled into the light guide. It can then also the second electromagnetic radiation over the radiation exit surface of the Fiber optics are decoupled again. Particularly preferred may the second radiation-emitting arrangement centered with respect to the back area be arranged.

at a preferred embodiment forms the radiation exit surface of the light guide part of the radiation output of the Device or is the radiation decoupling surface of the device.

In a particularly preferred embodiment, the radiation entrance surface over which the first electromagnetic radiation can be coupled into the optical waveguide is not arranged parallel to the radiation decoupling surface. In particular, this may mean that the radiation entrance surface is not arranged parallel to the radiation exit surface of the light guide. For example, the radiation entrance surface may be a side surface of the light guide. Particularly preferred for this purpose is the light guide designed as a flat, in particular plate-like, light guide. This may mean, in particular, that the optical waveguide has two main surfaces arranged opposite to one another, wherein the one main surface has or forms the radiation exit area, and the other main surface is the rear area which faces the second radiation-emitting arrangement. At least one side surface of the planar-shaped optical waveguide can have or form the radiation entrance surface for the first electromagnetic radiation. In this case, the optical waveguide can be formed as a flat-shaped body having two opposing main surfaces, which for example have the shape of an n-corner (n greater than or equal to 3), a circle, an ellipse or a combination thereof. Particularly preferred the light guide is formed as a flat cuboid, which may have a small thickness compared to the measurements of the main surfaces. Furthermore, the optical waveguide can be planar, that is, with respect to the radiation exit surface and the rear surface, parallel to a plane, or curved. In this case, in particular, the radiation exit surface and the rear surface can have a curvature.

Of the In particular, light guide can comprise a moldable plastic. This can mean that the light guide through a molding process such as drawing, pressing or spraying, in particular injection molding, transfer molding or injection-compression molding, can be produced. Suitable materials for such a light guide can For example, polymethylmethacrylate (PMMA), polycarbonate or polystyrene be. Furthermore, the light guide may also include epoxy and / or silicone.

at a further embodiment the radiation-directing element has a reflective component such as a mirror, a reflective foil or a reflective one Layer on, at least partially in the beam path of the first electromagnetic radiation can be arranged. Especially For example, the radiation-directing element may be a light guide as further have described above, in which on the opposite of the radiation exit surface arranged back Area at least partially arranged a reflective component such as a mirror is. Alternatively or in addition can also be on the back area a reflective layer may be applied. In particular, can that of the radiation exit surface opposing rear area of the light guide be shaped so that it together with the reflective Layer or the reflective component is suitable, electromagnetic To reflect radiation to the radiation exit surface. For example can the back area reflective surface areas, in the form of grooves or microprism structuring, for example, such an angle with the propagation direction of the first electromagnetic Include radiation, that at least a part of the first electromagnetic radiation from these surface areas to the radiation exit surface can be directed.

at a further embodiment the light guide has an opening on, which extends from the radiation exit surface to the back surface, leaving a through opening is present in the light guide. In particular, it may be advantageous be when the opening is present in the second portion of the radiation output surface or this completely occupy. Advantageously, thereby the opening in the beam path of the be arranged second electromagnetic radiation, so that the second electromagnetic radiation directly, ie without in to be coupled to the optical fiber, emitted via the radiation decoupling surface can be. For example, the top of the opening, in a plane or area with the radiation exit surface of the optical fiber can form part of the radiation decoupling surface.

at a further embodiment the light guide has side walls in the region of the opening, the to the opening can border. The side walls can while the radiation exit surface and that of the radiation exit surface opposite arranged surface connect or adjoin the optical fiber. In particular, the side walls can do this adjoin the radiation exit surface. Particularly preferably, the side walls of the opening have a reflective Layer or coating on. The reflective layer or coating can be executed in this way be that, for example, the first electromagnetic radiation, which meets within the light guide on a side wall, of this back is reflected in the light guide. Alternatively or additionally the reflective layer or coating be designed so that the second electromagnetic radiation that is inside the opening meets at least one side wall, is reflected by this. Especially because of it It may be possible, for example be that through the opening the second portion of the radiation decoupling surface is formed while passing through the Optical fiber, the first part of the radiation decoupling surface formed becomes.

In a further embodiment, the first radiation-emitting component and / or the second radiation-emitting component is designed as a point-like, as a linear or as a planar radiation source. In particular, a first and / or second radiation-emitting component embodied as a linear radiation source can preferably be stretched, that is to say parallel to a straight line, but also curved. In particular, the first radiation-emitting component and / or the second radiation-emitting component can comprise a fluorescent lamp, in particular a cold cathode fluorescence lamp (CCFL), a hot cathode fluorescence lamp (HCFL), a fluorescent lamp with external electrodes (FIG. External electrode fluorescence lamp, EEFL) or a flat fluorescence lamp (FFL). Alternatively or additionally, the first and / or the second radiation-emitting component may comprise or be an electroluminescent film. Furthermore, the first and / or the second radiation-emitting component may comprise a light-emitting diode, in particular an inorganic or an organic one Led. The light-emitting diode may have a mounting plane and electromagnetic radiation preferably directed away from the mounting plane, ie upwards, or along the direction of expansion of the mounting plane, ie laterally radiate. In this case, it may furthermore be advantageous if a radiation-emitting component comprises a plurality of light-emitting diodes which emit the same or different electromagnetic radiation. In particular, in the case of a first and / or second radiation-emitting component which has a plurality of LEDs, the color location of the first and / or second electromagnetic radiation can be varied and / or optimized by an active control of the LEDs.

Farther can the first and / or the second radiation-emitting arrangement have a reflector that is suitable, the emitted first or second electromagnetic radiation in one direction and / or to direct and / or focus a room area or to collapse. The reflector can be designed as a reflector housing, in which the first or second radiation-emitting component or a plurality of each is arranged and that the first or second radiation-emitting component, for example encloses to one side. The reflector can also be used as part of a radiation-emitting component be executed. The reflector can, for example, a parabolic, a polygonal, such as a rectangular or trapezoidal, or a circular or elliptical Have cross section or as an involute reflector, in particular in the form of a circle involute.

at a further preferred embodiment is a diffuser in the beam path of the first and / or second arranged electromagnetic radiation. That may mean that the diffuser of the first and / or the second radiation-emitting Order is arranged downstream. A diffuser can scatter centers have, by a local and / or angular distribution of a electromagnetic radiation can be increased and / or randomized can. For example, you can Such scattering centers reflective or radiation-refractive, so refractive, be. It can Scattering centers in the form of particles in a transparent matrix, be made of a plastic, embedded. Alternatively, scattering centers also by surface or interface structures be either irregular or regular can. The surface structures can while on radiation entrance surfaces or on radiation exit surfaces be formed of the diffuser. For example, irregular structures can be are formed by a roughness structure of a surface while regular structures for example, may have a microprism structuring. Furthermore, scattering centers be formed by a so-called micro-dot structure. That can mean that point or particulate areas as scattering centers on a surface or are arranged inside the diffuser, the reflective or refractive properties. The diffuser may be preferred have a homogeneous distribution of the scattering centers, so for example a uniform distribution of particles or uniform roughness or a uniform and homogeneous microprism structuring. Alternatively, the diffuser Areas with an elevated Scatter tower density and area with a decreased screed tower density exhibit, with the transition between these areas can be continuous or sudden.

Especially For example, the radiation-directing element may comprise a diffuser. Thereby can with advantage by the radiation-directing element, for example the first electromagnetic radiation to be steered as well as the Local and / or angular distribution the first electromagnetic radiation can be increased. For example, can the radiation-directing element is a mirror or a reflective layer having a roughened or textured surface. Furthermore, the radiation-guiding element can be a light guide having scattering centers as described above. A radiation-directing In addition, element with diffuser can be suitable, at least first and second electromagnetic radiation partly to mix.

at a further embodiment is the reflector or the reflector housing of the first and / or the second radiation-emitting arrangement also formed as a diffuser. This may in particular mean that the reflector or the reflector housing a at least partially diffusely reflecting surface, such as with a roughness structure or a microprism structuring.

In a further embodiment, the diffuser is arranged downstream of the radiation-directing element in the beam path of the first and / or the second electromagnetic radiation. In particular, this may mean that the diffuser has a radiation exit surface which forms the radiation output surface of the device or a part thereof. Furthermore, the radiation-directing element can be arranged downstream of the diffuser in the beam path of the first and / or the second radiation-emitting arrangement. For example, the first and / or the second radiation-emitting arrangement may include the diffuser for this purpose. In addition, the diffuser can be arranged in or over an opening of a radiation-guiding element designed as a light guide. It can be possible that the diffuser increases only the local and / or angular distribution of the second electromagnetic radiation that passes through the opening of the optical fiber.

at a preferred embodiment the first radiation-emitting device has a plurality of first ones radiation-emitting components on the same side or disposed on different sides of the radiation-directing element are. Particularly preferably, the radiation-guiding element has a first side, on the at least one of the plurality of the first radiation-emitting Components is arranged as well as a second side on which at least another of the plurality of first radiation-emitting components is arranged. The first and the second side are preferred different from each other. In particular, the first radiation-emitting Components should be arranged so that they converge beam paths exhibit. Is the radiation-directing element designed as a light guide, this may mean that the optical fiber, for example, a plurality of radiation entrance surfaces on a plurality of sides and each one of the plurality the radiation entrance surfaces arranged downstream of at least a first radiation-emitting component is. Particularly preferred are the first and the second side at designed as a light guide radiation-directing element opposite each other Pages. In particular, you can the sides to the radiation exit surface of the light guide as well to the radiation exit surface opposite arranged back area adjoin and thus formed as side surfaces of the light guide be. Furthermore can first radiation-emitting components on adjacent, to each other adjacent sides or side surfaces or continue to arranged on all sides or side surfaces of the light guide be.

at a further preferred embodiment are the radiation directing element and the majority of the first radiation-emitting components side by side, so approximately arranged in a surface. The area can be in particular, be a plane. Alternatively, the surface may also be curved. In particular, the area can be also a virtual area which is suitable, the geometry of the radiation-directing element simplistic to describe. Particularly preferably, the surface can be parallel be to the radiation decoupling surface. For example, the radiation-directing element can be a plate-shaped, in particular have a flat cuboid light guide. The virtual area for simplified geometric description of the light guide can then be approximately a plane of symmetry of the parallelepiped parallel to the radiation exit surface.

at a further embodiment the second radiation-emitting arrangement has a plurality of second radiation-emitting components. Especially may be the plurality of second radiation-emitting components adjacent to each other, so for example in the same reflector box be arranged.

A Plurality of first and / or second radiation-emitting components For example, a row and / or column-like arrangement be of radiation-emitting components mentioned above, So about an LED array.

at a further embodiment is the radiation decoupling surface downstream of an optical element. Such an optical element For example, a diffuser, as described above, a wavelength converter, a lens or a polarizer. In particular, it can be beneficial be when the optical element is a polarizer, which is for electromagnetic Radiation is transmissive with a polarization direction and for electromagnetic Radiation with the orthogonal polarization direction reflective. In particular, such a polarizer can have an advantage when the from the polarizer reflected electromagnetic radiation at one reflective layer, a mirror or a reflector again back is reflected to the polarizer, and it will be advantageous can, if the polarization direction of the electromagnetic radiation then according to the transmitting polarization direction of the Polarizer is aligned. For this purpose, the device, for example another suitable optical element, such as a wave plate, include.

at a further embodiment arouses the electromagnetic radiation emitted by the radiation decoupling surface Radiation a homogeneous light impression in a viewer. there can "homogeneous" a uniform luminance distribution and / or a uniform color impression mean. In particular, such a device is for example suitable as backlight for Display devices can be used. Alternatively, the radiation decoupling surface also create an inhomogeneous illumination effect on a viewer. there can be "inhomogeneous" in particular one Color or brightness curve mean on the radiation decoupling surface. For example, the radiation decoupling surface a brighter light impression in second subregion of the radiation decoupling surface than in the first Subarea or vice versa. Furthermore, in the second subarea a different color impression than in the first part of a viewer to be awakened.

A display device according to at least An embodiment of the invention comprises in particular a device according to at least one of the above-mentioned embodiments and a liquid crystal matrix. In this case, the liquid crystal matrix is particularly preferably the radiation outcoupling surface of the device in the device beam path, that is, downstream of the beam path of the first and second electromagnetic radiation emitted by the radiation outcoupling surface. The liquid-crystal matrix can be formed as an active or passive liquid-crystal matrix and can have individual pixels or sub-pixels.

Further advantages and advantageous embodiments and developments of the invention will become apparent from the following in conjunction with the figures 1A to 9 described embodiments.

It demonstrate

1A and 1B schematic representations of a device according to an embodiment,

1C the luminance distribution on the radiation decoupling surface of a device according to an embodiment,

2 to 9 schematic representations of various embodiments of devices according to the invention.

In the embodiments and figures can same or equivalent components, each with the same Be provided with reference numerals. The illustrated elements and their proportions with each other are basically not as true to scale to look at, rather individual elements such as layers, components, components and areas for better presentation and / or better Understanding exaggerated thick or large be shown.

In the 1A and 1B is an embodiment of a device 100 for emitting a first and a second electromagnetic radiation 13 . 23 shown. The 1C shows the luminance distribution of the first and second electromagnetic radiation 13 . 23 on the radiation decoupling surface 5 the device 100 , The in the 1A and 1B representations shown correspond to sectional views of the device 100 along the respectively designated AA and BB sectional planes in the other figure. The following description of the device relates equally to the 1A to 1C ,

The device 100 has a first arrangement 1 on that a first electromagnetic radiation 13 radiates. In this case, the first arrangement comprises 1 first radiation-emitting components 10 on two opposite side surfaces 31 . 32 a radiation-directing element that acts as a light guide 3 is executed, are arranged. The geometry of the light guide can be simplified characterized by a virtual surface F, which is executed in the embodiment shown as a plane. The first radiation-emitting components 10 are along the entire side surfaces 31 . 32 in the surface F arranged so that the first electromagnetic radiation 13 each over the entire page length of the pages 31 . 32 can be coupled into the light guide. These are the first radiation-emitting components 10 For example, they are designed as cold cathode fluorescent lamps (CCFL), each extending over the entire side surfaces 31 . 32 extend. Alternatively or additionally, the first radiation-emitting components 10 Also, LEDs or preferably LED arrays have the addition or instead of the CCFL on the sides 31 . 32 of the light guide 3 are arranged. In particular, in the embodiment shown with CCFL as the first radiation-emitting components 10 has the first radiation-emitting arrangement 1 furthermore reflector housing 11 formed so that the entire of the first radiation-emitting components 10 emitted first electromagnetic radiation 13 to the light guide 3 radiated out and collimated. Through the reflector housing 11 can also be first electromagnetic radiation 13 that are not in the direction of the light guide 3 is emitted from the usually cylindrically symmetric radiating CCFL to the light guide 3 directed and coupled into this. The first radiation-emitting components 10 are on the side surfaces 31 . 32 arranged so that they have converging beam paths.

The light guide 3 has a main surface 35 on, which is designed as a radiation exit surface of the light guide. In this case forms the radiation exit surface 35 of the light guide 3 in the illustrated embodiment, the radiation output surface 5 the device 100 , Furthermore, the light guide 3 one of the radiation exit surface 35 opposite main surface 33 on that as a back surface 33 is trained. Center to the sides 31 . 32 on the main surface 33 , so the back surface 33 , points the device 100 furthermore a second radiation-emitting arrangement 2 on that a second electromagnetic radiation 23 radiates. The second radiation-emitting arrangement 2 has second radiation-emitting components 20 on, which may be in the illustrated embodiment, for example, a planar arrangement of LEDs, ie an LED array or a plurality of CCFL. The second radiation-emitting components 20 are in a reflector box 21 arranged, which has reflective inner walls and is open to the light guide, so that the second electromagnetic radiation 23 to the light guide 3 and in particular to the area 33 is radiated out and the light guide 3 thus the second radiation-emitting arrangement 2 is subordinate.

As described above, the first electromagnetic radiation 13 preferably parallel to the main extension direction of the radiation coupling-out surface 5 the device 100 , indicated by the arrow L, to the light guide 3 radiated out and coupled into this. However, the light guide points 3 on the main surface 33 a reflective layer that extends over the entire surface 33 except the area where the reflector box 21 is arranged extends. This can cause electromagnetic radiation that does not move in the direction of the radiation exit surface 35 but towards the main back surface 33 out in the light guide 3 spreads, from this to the radiation exit surface 35 be steered. Advantageously, the first electromagnetic radiation 13 over the subarea 51 , in the embodiment shown, the entire radiation exit surface 35 includes, from the light guide 3 be disengaged and radiated by this. The light guide 3 is designed and shaped so that the first electromagnetic radiation 13 preferably with a homogeneous luminance distribution over the radiation exit surface 35 of the light guide 3 and thus over the radiation output surface 5 the device 100 can be radiated. This can be the area 33 for example to the radiation exit surface 35 be tilted and / or have a step or prism structuring. Such formations of the surface 33 are particularly suitable for the first electromagnetic radiation 13 as evenly as possible with respect to the main extension direction L of the radiation exit surface 35 to the radiation exit surface 35 to steer towards.

The second electromagnetic radiation 23 will be over the area 33 in the light guide 3 coupled and over the radiation exit surface 35 in the subarea 52 decoupled, which, like the first sub-area over the entire radiation decoupling surface 5 extends. In the exemplary embodiment shown, the first and second partial areas thus overlap 51 . 52 , The of the device 100 over the radiation decoupling surface 5 decoupled electromagnetic radiation 53 thus points over the entire radiation output surface 5 a mixture of the first and second electromagnetic radiation 13 . 23 on, as related to 1C explains the relative proportions of the first and second electromagnetic radiation 13 . 23 along the Hauptausdehnungsrichtung L vary over the radiation decoupling surface. The of the radiation decoupling surface 35 radiated electromagnetic radiation 53 is emitted along a device beam path.

The light guide 3 has a transparent material that is suitable for the first and the second electromagnetic radiation 13 . 23 to direct and to transmit. For example, the light guide 3 manufactured from a plastic suitable for a molding process, such as PMMA or polycarbonate.

The first and second radiation-emitting devices 1 . 2 preferably emit the same or a similar electromagnetic radiation, in particular an electromagnetic radiation, which can awaken a white or whitish light impression in a viewer. In order to awaken the most homogeneous possible white light impression in a viewer, it may be advantageous if the first and the second electromagnetic radiation 13 . 23 preferably comprise equal or nearly equal wavelengths having the same or at least similar respective intensity. The white or whitish light impression can range from cool white to warm white. If, for example, LEDs in the form of an LED array are used as the second radiation-emitting component, then the LEDs either each have a white emission spectrum or an LED array comprises a plurality of LEDs with different-colored emission spectra, which lead to a white or whitish illumination impression in an overlay. Through the use of an LED array, the luminous impression can be varied by targeted control of the individual LEDs.

Characterized in that the second radiation-emitting arrangement 2 not on the side surfaces 31 . 32 but is preferably arranged centrally on a main surface, in particular by the lateral arrangement of the first radiation-emitting arrangement 1 in a plane with the light guide 3 a very small depth near the sides 31 . 32 be achieved. The construction depth near the sides 31 . 32 is essentially due to the thickness of the light guide 3 in this area and the width of the first radiation-emitting arrangement 1 given. As a result, a thermal optimization is possible because the first and second radiation-emitting components 10 . 20 can be positioned specifically and optimally under thermal aspects as well as in terms of luminous intensity and that of the radiation-emitting component 10 . 20 Waste heat generated during operation can be dissipated separately. Furthermore, by using the first and second radiation-emitting arrangement, the aging of first and / or second radiation-emitting components can be compensated for by individual control of the radiation-emitting components.

The Indian 1C Graph shown illustrates the operation of the device 100 in terms of a homogeneous luminance distribution over the radiation decoupling surface 5 , The x-axis designated L thereby indicates the position on the radiation coupling-out surface 5 in the direction of the main expansion direction of this, shown by the arrow L in 1A , at. The x-axis extends from the side 31 of the light guide 3 to the side 32 , Furthermore, the first subarea 51 and the second subarea 52 indicated. The y-axis denoted by I is a measure of the luminous intensity of the radiation output surface 5 radiated electromagnetic radiation.

The curve indicates 1001 the luminous intensity first electromagnetic radiation 13 , It can be seen that through the light guide 3 the first electromagnetic radiation 13 near the sides 31 . 32 can be emitted with a homogeneous luminous intensity. In this case, the luminous intensity in the first subarea 51 by a first light intensity 131 be characterized. To the center of the radiation decoupling surface 5 towards the center of the axis labeled L, the first electromagnetic radiation has a luminous intensity gradient, the luminous intensity being at a second luminous intensity 132 drops, which is less than half the maximum luminous intensity 131 is. Thus, the first radiation-emitting arrangement becomes 1 preferably near the sides 31 . 32 from the radiation decoupling surface 5 radiated.

The curve 1002 whereas, the luminous intensity denotes the second electromagnetic radiation 23 on the radiation decoupling surface 5 along the main extension direction L. Due to the arrangement and configuration of the second radiation-emitting arrangement, the second electromagnetic radiation 23 preferably in the middle region of the radiation outcoupling surface 5 radiated.

The curve 1010 shows the luminous intensity of the whole of the radiation decoupling surface 5 radiated electromagnetic radiation 53 that is a mixture of the first and second electromagnetic radiation 13 . 23 is. It can be seen that, due to the superimposition of the first and second subareas, a homogeneous luminance distribution over the entire radiation decoupling surface 5 can be achieved.

By the combination of the first and second radiation-emitting arrangement 1 . 2 can with advantage with a high homogeneity of the luminance distribution on the radiation output surface 5 a high luminance with a small number of radiation-emitting components 10 . 20 be achieved, whereby an economical operation of the device 100 is possible.

The embodiments shown in connection with the following figures relate to extensions and modifications of the in connection with the 1A to 1C shown embodiment, so that in the following embodiments mainly addresses these extensions and modifications.

That in the 2 shown embodiment of a device 200 has a light guide 3 with an opening 39 , The opening 39 is the second radiation-emitting arrangement 2 downstream and arranged in the beam path. The opening 39 covers the opening of the reflector box 21 , As a result, the second electromagnetic radiation directly, that is, without in the light guide 3 on and out of this to be decoupled from the device 200 be radiated.

In particular, the opening 39 through sidewalls 34 limited. The number of side walls 34 depends on the shape of the opening 39 from, which may be rectangular, for example, in the illustrated embodiment. The side walls 34 are covered with a reflective layer and thus have a silvering, for example a Metallverspiegelung on. The mirror coating is designed as a reflector film or alternatively as a mirror and designed in the embodiment shown so that the second electromagnetic radiation in the opening 39 on the side surfaces 34 meets, can be reflected. This sets the reflector box 21 the second radiation-emitting arrangement 2 effective at the radiation exit surface 35 of the light guide 3 so that the depth of the reflector box 21 and thus the depth of the second radiation-emitting arrangement 2 can be reduced.

Alternatively or additionally, the mirroring of the side surfaces 34 also the light guide 3 be facing so that the first electromagnetic radiation that is inside the light guide 3 meets the mirroring, back into the light guide 3 can be reflected. This can increase the efficiency of the light guide 3 by increasing the luminance of the first electromagnetic radiation passing through the radiation exit surface 35 is reached.

In particular, by a mirroring of the side surfaces 34 avoid the second electromagnetic radiation over the sidewalls 34 in the light guide 3 is coupled and the first electromagnetic radiation from the light guide 3 through the side walls 34 is decoupled. If such an effect is not desired at the moment, a mirroring of the side surfaces may be required 34 also be waived. The opening 39 forms in the embodiment shown a second portion 52 the radiation decoupling surface 5 while the radiation exit surface 35 of the light guide 3 a first subarea 51 forms. The first section 51 borders on the second subarea 52 and encloses this, wherein the first and the second portion 51 . 52 are different from each other.

The second radiation-emitting arrangement 2 has in the illustrated embodiment, a planar radiation-emitting device 20 on, for example, a surface designed fluorescent lamp (FFL). Alternatively or additionally, the surface-configured radiation-emitting component 20 also have or be an OLED or an electroluminescent.

Furthermore, in the embodiment shown, the side surfaces 31 . 32 of the light guide 3 configured such that the first radiation-emitting arrangement 1 and in particular the first radiation-emitting components 10 at least partially from the light guide 3 be enclosed, whereby the first electromagnetic radiation efficiently into the light guide 3 can be coupled. The first radiation-emitting arrangement 1 can also continue a reflector box or Verspiegelungen the radiation-emitting components 10 or the fiber optic sides 31 . 32 have (not shown).

This in 3 shown embodiment of a device 300 has an opening similar to the previous embodiment 39 in the light guide 3 on. In the device 300 has the second radiation-emitting arrangement 2 but a reflector 21 with sloping side surfaces that open up as side surfaces 34 the opening 39 in the light guide 3 continue. The side surfaces of the box-shaped reflector 21 close with the back surface 33 of the light guide 3 an angle 23 a, which is greater than 90 degrees in the embodiment shown with about 135 degrees. Alternatively, the angle 23 have a value greater than 0 and less than 180 degrees. Through an angle 23 , which is greater than 90 degrees, can generate second electromagnetic radiation from a larger subarea 52 the radiation decoupling surface 5 are emitted without the number, size or distribution of the second radiation-emitting components 20 to have to change compared to the previous embodiments. The side surfaces 34 can be mirrored as in the previous embodiment.

Over the light guide 3 with the opening 39 is a diffuser 6 arranged, which allows an increase in the homogeneity of the luminance of the first and second electromagnetic radiation with respect to a location and an angular distribution. It forms the light guide 3 opposite side 65 of the diffuser, the radiation decoupling surface 5 the device 300 , The first and second sections 51 . 52 the radiation decoupling surface 5 partially overlap. The diffuser 6 may be configured according to one of the embodiments described in the general part.

In particular, the diffuser 6 alternatively in the light guide 3 Being integrated, that means the light guide 3 and the diffuser 6 are integrally formed and the diffuser 6 also has radiation-conducting properties.

In the embodiment according to the 4 is a device 400 shown in which a diffuser 6 in the opening 39 of the light guide 3 is fitted and thereby into the light guide opening 39 is integrated. It can be at a reflector box 21 with bevelled side walls, which are in bevelled side walls 34 the opening 34 continue, even the diffuser 6 Be suitably bevelled to fit into the opening 39 to be integrable. In addition, the diffuser 6 for increasing the stability with the light guide 3 not only form-fitting but also cohesively, for example by gluing, be arranged.

Through the diffuser 6 in the opening 39 can just the luminance of the second radiation-emitting device 2 emitted second electromagnetic radiation to be homogenized in terms of a local and angular distribution. In particular, this may be advantageous if, as in the embodiment shown, an LED array as the second radiation-emitting component 20 is used and the individual LEDs should not be recognizable as separate radiation sources from a viewer. In addition, the light guide can 3 for example, as a radiation exit surface 35 have a further diffuser. The second radiation-emitting arrangement 2 applied page 65 of the diffuser and the radiation exit surface 35 of the light guide 3 form the radiation decoupling surface 5 the device 400 ,

In the embodiment according to the 5 is a device 500 shown a light guide 3 in which the radiation exit surface 35 that the radiation decoupling surface 5 the device 500 forms, a structuring 60 having. The structuring 60 has refractive elements 61 , For example, in the form of so-called micro-Dots, which are suitable, the coupling-out probability of electromagnetic radiation from the optical fiber 3 to increase. The electromagnetic radiation is preferably the first electromagnetic radiation emitted by the first radiation-emitting arrangement 1 as parallel as possible to the radiation exit surface 35 in the light guide 3 coupled becomes. Through the micro-dots 61 and a suitable distribution of these on the radiation exit surface 35 may advantageously have a homogeneous luminance distribution, preferably the first electromagnetic radiation coming from the radiation output surface 5 the device 500 is disbursed, favored. Furthermore, the coupling-out probability for the second electromagnetic radiation through the micro-dots 61 to be influenced. By a suitable distribution of micro-dots 61 It is also possible to achieve an improved mixing of the first and second electromagnetic radiation, in particular in partial areas covering the first and the second partial area.

Alternatively or additionally, the structuring 60 reflective elements 61 For example, in the form of micro-dots have, from the light guide 3 through the radiation exit surface 35 decoupled radiation back into the light guide reflected back. In particular, is a reflective elements 61 having structuring 60 thereby also suitable, electromagnetic radiation, such as first electromagnetic radiation, more homogeneous within the light guide 3 to distribute and thus, for example, a more homogeneous decoupling of the first electromagnetic radiation via the radiation decoupling surface 5 to enable.

The structuring 60 in the form of micro-dots 61 may alternatively or additionally also within the light guide 3 be integrated, or in addition or as an alternative to a mirroring of the radiation exit surface 35 opposite surface 33 on the surface 33 be arranged.

Furthermore, the structuring 60 also elements 61 comprising wavelength conversion materials, which can at least partially convert the first electromagnetic radiation and / or the second electromagnetic radiation into electromagnetic radiation having a different color from the first and / or second electromagnetic radiation.

Instead of or in addition to the micro-dots 61 can the structuring 60 also have, for example, line or groove-shaped structures.

6 shows an embodiment of a device 600 in a plan view of the radiation decoupling surface 5 , The light guide 3 corresponds to the light guide 3 the device 200 as in the embodiment according to the 2 shown, wherein the embodiment of the 2 a section of the device 600 along the in 6 shown section plane CC corresponds. The device 600 has a light guide 3 with rectangular shape on, on its sides 31 . 32 a first radiation-emitting arrangement 1 that has CCFL covering the pages 31 . 32 extend. Furthermore, the device 600 the second radiation-emitting arrangement 2 in whose beam path the opening 39 of the light guide 3 is arranged. The second radiation-emitting arrangement 2 has as radiation-emitting components 20 also CCFL on. The opening 39 is rectangular in the embodiment shown, depending on the application other forms are possible.

Devices with a rectangular cross-section of the radiation decoupling surface 5 like the device 600 in conjunction with the 6 shown, are particularly suitable for large-scale display or display backlights, as compared to conventional backlighting an economical and cost-effective operation by a small number of radiation-emitting components 10 . 20 and a small depth just near the sides 31 . 32 is possible. In particular, for display applications, for example, the second radiation-emitting arrangement 2 be integrated into a stand of the displays, whereby a space-saving design can be made possible.

The device 700 according to the embodiment in 7 Like the preceding embodiment, it is in a plan view of the radiation decoupling surface 5 shown by the radiation exit surface 35 of the light guide 3 is formed. The device 700 has a light guide 3 with a hexagonal shape and a first radiation-emitting arrangement 1 on. The first radiation-emitting device comprises one on each of the sides 311 . 312 . 313 . 314 . 315 . 316 arranged plurality of radiation-emitting components 10 , which have converging beam paths. The radiation-emitting components 10 comprise individual LEDs or LED arrays, which are suitable, for example, to generate white light. In the middle of the light guide 3 is on the radiation exit surface 35 facing away from the rear main surface 33 the second radiation-emitting arrangement 2 arranged. This has a reflector box 21 on, which is indicated by the dashed line, as well as radiation-emitting components 20 , which are for example LEDs or multiple numbers of LEDs. The second radiation-emitting arrangement 2 is preferably suitable for emitting white light. The device 700 can be used for example as a light tile or as part of a light tile. In particular, the hexagonal shape of the device is suitable 700 to several similar devices 700 to arrange next to each other over a large area. Alternatively, the device 700 to have a different polygonal shape.

Alternatively, the first and / or the second radiation-emitting arrangement 1 . 2 also emit colored light. Especially when using the device 700 As a light tile, it may be desirable for the first radiation-emitting arrangement 1 and the second radiation-emitting device 2 each radiate a first or a second electromagnetic radiation, which can raise a different color impression and / or a different brightness impression in a viewer. It may also be desirable for the first radiation-emitting components 10 and / or the second radiation-emitting components 20 For example, by a variable control different color impressions and / or different brightness impressions in a viewer can awaken.

In the embodiment according to the 8th is a device 8th which can be used, for example, as a light tile or as part of it. The light guide 3 , the shape of the radiation decoupling surface 5 as well as the first radiation-emitting arrangement 1 can have, for example, features according to the previous embodiment. In particular, the device 800 a second radiation-emitting arrangement 2 with a reflector box 21 up, different from the radiation-emitting components 20 , which are designed as LEDs, to the light guide 3 tapered in its cross-sectional area, so that the side walls of the reflector box 21 with the area 33 of the light guide an angle 23 which is less than 90 degrees. As a result, the luminous intensity of the second radiation-emitting arrangement can be advantageous 2 in the area 52 increase.

Furthermore, in the reflector box 21 a diffuser 6 in the beam path of the second radiation-emitting components 20 arranged, the homogeneous radiation of the second electromagnetic radiation by the second radiation-emitting arrangement 2 allows, so that the individual second radiation-emitting components 20 are no longer recognizable as a single radiation sources for a viewer. Such a second radiation-emitting arrangement 2 may be advantageous to an inhomogeneous brightness impression and / or color impression in a viewer of the device 800 to awaken. In particular, the second subarea 52 the radiation decoupling surface 5 have a higher or lower luminous intensity than the first portion 51 , The first and / or the second radiation-emitting components 10 . 20 can each radiate different colors from each other, so that a specific regulation of the individual first and / or second radiation-emitting components 10 . 20 a variable color mixture according to the by the first and / or second radiation-emitting components 10 . 20 predetermined gamut is made possible.

In 9 is an embodiment of a display device 900 shown. The display device 900 includes by way of example a device 500 according to the embodiment in 5 , Alternatively, the device 500 further or alternative features of at least one of the other embodiments shown above or according to the embodiments in the general part of the description. The radiation output surface 5 the device 500 are in their device beam path an optical element 7 and a liquid crystal matrix 8th downstream. The liquid crystal matrix may be active or passive and has pixels or sub-pixels 81 on.

The optical element 7 For example, it can have a diffuser or a coupling-out structure in order to allow the most homogeneous possible emission of the first and second electromagnetic radiation. For this, the optical element 7 For example, have a microprism structuring. Furthermore, the optical element 7 For example, have a polarizer or polarizing filter, which is preferably designed such that electromagnetic radiation having a polarization direction through the optical element 7 is transmitted while the electromagnetic radiation with orthogonal polarization direction to the device 500 is reflected back. The reflected electromagnetic radiation can then, for example, at the radiation output surface 5 opposite surface 33 of the light guide 3 or at the reflector box 21 the second radiation-emitting arrangement 2 again in the direction of the optical element 7 be reflected. When traversing, for example, through the light guide 3 and / or structuring 60 and / or by the reflection on the surface 33 or the light box 21 It may be possible that the polarization direction is changed so that the electromagnetic radiation is now the optical element 7 can cross. This can increase the luminance of the display device 900 in conjunction with a homogeneous luminance distribution compared to a similar display device without optical element 7 be achieved.

The The invention is not by the description based on the embodiments limited to these. Rather, the invention encompasses every new feature as well as every combination of features, in particular any combination of features in the claims includes, even if this feature or this combination itself not explicitly in the patent claims or embodiments is specified.

Claims (42)

Device for emitting a first and a second electromagnetic radiation ( 13 . 23 . 53 ) via a radiation decoupling surface ( 5 ) along a device beam path, comprising - a first radiation-emitting arrangement ( 1 ) with at least one first radiation-emitting component ( 10 ), which is the first electromagnetic radiation ( 13 ), - a second radiation-emitting arrangement ( 2 ) with at least one second radiation-emitting component ( 20 ), which is the second electromagnetic radiation ( 23 ), and - a radiation-directing element ( 3 ), wherein - the radiation output surface ( 5 ) in the beam path of the second radiation-emitting arrangement ( 2 ) and - the radiation-directing element ( 3 ) the first electromagnetic radiation ( 13 ) to the radiation decoupling surface ( 5 ) steers. Device according to the preceding claim, wherein - the first electromagnetic radiation ( 13 ) by the radiation-directing element ( 3 ) in the direction of the beam path of the second electromagnetic radiation ( 23 ) is directed. Device according to one of the preceding claims, wherein - the first radiation-emitting arrangement ( 1 ) laterally offset to the radiation decoupling surface ( 5 ) is arranged. Device according to one of the preceding claims, wherein - the radiation-directing element has side surfaces and main surfaces, - the first electromagnetic radiation ( 13 ) of the first radiation-emitting arrangement ( 1 ) is irradiated into the radiation-directing element via a side surface and is directed toward a main surface. Device according to one of the preceding claims, wherein - the first electromagnetic radiation ( 13 ) at least over a first subregion ( 51 ) of the radiation output surface ( 5 ) and - the second electromagnetic radiation ( 23 ) at least over a second subregion ( 52 ) of the radiation output surface ( 5 ) is radiated. Device according to the preceding claim, wherein - the first subregion ( 51 ) and the second subarea ( 52 ) are at least partially different from each other. Apparatus according to claim 5, wherein - the first subregion ( 51 ) and the second subarea ( 52 ) at least partially overlap. Device according to one of claims 5 to 7, wherein the second subregion ( 52 ) on at least two sides of the first subregion ( 51 ) is limited. Device according to one of claims 5 to 8, wherein - the first electromagnetic radiation ( 13 ) in the first subarea ( 51 ) a first luminance ( 131 ) and in the second subarea ( 52 ) a second luminance ( 132 ), which is lower than the first luminance. Apparatus according to claim 7, wherein - the radiation-directing element ( 3 ) in the beam path of the second radiation-emitting arrangement ( 2 ) is arranged. Device according to one of the preceding claims, wherein the radiation-directing element ( 3 ) has a light guide with - a radiation entrance surface ( 31 . 32 ), over which the first electromagnetic radiation ( 13 ) is coupled into the light guide and - a radiation exit surface ( 35 ). Device according to the preceding claim, wherein - the light guide one of the radiation exit surface ( 35 ) opposite surface ( 33 ), over which at least partially the second electromagnetic radiation ( 23 ) is coupled into the light guide. Device according to one of claims 11 or 12, wherein - the radiation exit surface ( 35 ) at least a part of the radiation output surface ( 5 ). Device according to one of claims 11 to 13, wherein - the radiation entrance surface ( 31 . 32 ) not parallel to the radiation outcoupling surface ( 35 ). Device according to one of claims 11 to 14, wherein - the light guide ( 3 ) comprises a plastic. Device according to one of claims 11 or 15, wherein - the light guide ( 3 ) on one of the radiation exit surface ( 35 ) opposite surface ( 33 ) at least partially comprises a reflective layer or a reflective component. Device according to one of claims 11 to 16, wherein - the light guide ( 3 ) an opening ( 39 ) having. Device according to the preceding claim, wherein - the opening ( 39 ) in the beam path of the second electromagnetic radiation ( 23 ) is arranged. Device according to one of claims 11 to 18, wherein - the radiation exit surface ( 35 ) a main surface of the light guide ( 3 ) and is flat and / or flat. Device according to one of claims 17 or 18, wherein - the light guide ( 39 ) in the region of the opening ( 39 ) Side walls ( 34 ), which at the radiation exit surface ( 35 ) and having a reflective layer. Device according to one of the preceding claims, wherein - the first radiation-emitting component ( 10 ) and / or the second radiation-emitting component ( 20 ) comprises at least one radiation-emitting component from a group which is formed by: a cold-cathode fluorescent lamp, a hot-cathode fluorescent lamp, a fluorescent lamp with external electrodes, a flat fluorescent lamp, an electroluminescent sheet, an inorganic light-emitting diode, and an organic light-emitting diode. Device according to one of the preceding claims, wherein - the first radiation-emitting arrangement ( 1 ) and / or the second radiation-emitting arrangement ( 2 ) a reflector ( 11 . 21 ) exhibit. Device according to one of the preceding claims, wherein - a diffuser ( 6 . 60 ) in the beam path of the first and / or the second electromagnetic radiation ( 13 . 23 ) is arranged. Device according to the preceding claim, wherein - the radiation-directing element ( 3 ) the diffuser ( 6 . 60 ). Apparatus according to claim 23, wherein - the diffuser ( 6 ) the radiation-directing element ( 3 ) is subordinate. Device according to claim 17 or 18, wherein - a diffuser ( 6 ) in or above the opening ( 39 ) of the light guide ( 3 ) is arranged. Device according to claim 23, wherein - the second radiation-emitting arrangement ( 2 ) the diffuser ( 6 ). Device according to one of claims 23 to 27, wherein - the diffuser ( 6 . 60 ) Reflective and / or refractive structures ( 61 ). Device according to one of the preceding claims, wherein - the first radiation-emitting arrangement ( 1 ) a plurality of first radiation-emitting components ( 10 ) having. Device according to the previous claim, wherein - the first have radiation-emitting components converging beam paths. Device according to the preceding claim, wherein - the radiation-directing element ( 3 ) has at least one first and second side surface and main surfaces, at least one of the plurality of first radiation-emitting components ( 10 ) on a first side surface ( 31 ) of the radiation-directing element ( 3 ), - at least one of the plurality of first radiation-emitting components ( 10 ) on a second side surface ( 32 ) of the radiation-directing element ( 3 ) and - the first and the second side surface ( 31 . 32 ) of the radiation-directing element ( 3 ) are different from each other. Apparatus according to the preceding claim, wherein - the first page ( 31 ) and the second page ( 32 ) two sides facing away from each other ( 31 . 32 ) of the radiation-directing element ( 3 ) are. Device according to one of the preceding claims 30 or 31, wherein the second radiation-emitting arrangement ( 2 ) on a main surface of the radiation-directing element ( 3 ) is arranged. Device according to one of claims 29 to 33, wherein - the plurality of first radiation-emitting components ( 10 ) of the first radiation-emitting arrangement ( 1 ) and the radiation-directing element ( 3 ) are arranged in a surface (F). Device according to the previous claim, wherein - the area one Level is. Apparatus according to claim 34 or 35, wherein - the surface parallel to the radiation decoupling surface ( 5 ). Device according to one of the preceding claims, wherein - the second radiation-emitting arrangement ( 2 ) a plurality of second radiation-emitting components ( 20 ) having. Device according to one of the preceding claims, wherein - the radiation output surface ( 5 ) a polarizer ( 7 ) is subordinate. Device according to one of the preceding claims, wherein - the radiation output surface ( 5 ) awakens a homogeneous light impression for an external observer. Device according to one of claims 1 to 38, wherein - the radiation decoupling surface ( 5 ) awakens an inhomogeneous luminous impression an external observer. Device according to one of the preceding claims, wherein - the radiation-directing element ( 3 ) the first electromagnetic radiation ( 13 ) so to the radiation coupling surface ( 5 ) deflects the beam path of the first and second radiation-emitting devices into a common device beam path of the device. A display device comprising - a device according to any one of claims 1 to 41 and - a liquid crystal matrix ( 8th ), wherein the liquid crystal matrix ( 8th ) of the radiation output surface ( 5 ) is arranged downstream in the device beam path of the device.